Specifications

ATAPI For Streaming Tape QIC-157 Rev B
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If the PREVENT bit is set, the Device defaults in the Prevent state after power up.
If the LOCKED bit is set, the volume is locked.
If the LOCK bit is set, the Device supports locking the volume using the ALLOW/PREVENT
MEDIUM REMOVAL command.
If the SLOWB bit is set, the Device restricts the byte count for PIO transfers for slow buffer
memory.
If the BLK1024 bit is set, the Device supports 1024 byte block size.
If the BLK512 bit is set, the Device supports 512 byte block size.
The Maximum Speed Supported field indicates the actual maximum data that the Device
supports. This value is returned as 1000 bytes per second that the data is transferred between the
Host and the Device.
The Continuous Transfer Limit field indicates the number of blocks for the current block size that
can be transferred without delay due to a buffer limitation. The DSC bit in the Status Register set
indicates that the specified number of blocks can be transferred without delay. This information
allows techniques that maximize the bus bandwidth.
The Current Speed Selected field indicates the actual data rate that the Device is currently using
this value is return as 1000 bytes per second that the data is transferred between the Host and the
Device.
The Buffer Size is an estimate in 512 byte increments of the read and write buffer size to aid in
establishing meaningful buffer ratios in the Device Configuration Page.